#include <stdio.h>
#include <limits.h>

int main(int argc, char const *argv[])
{
    int N;
    float n; // 水分子个数
    float mass = 3e-23;

    scanf("%d", &N);
    printf("总共有%f个水分子\n", N/mass);
    printf("总共有%e个水分子\n", N/mass);
    printf("总共有%.2e个水分子\n", N/mass);

    return 0;
}
